If updates were fully backwards compatible, they wouldn’t be upgrades, they would be addons.
Windows has been notoriously backwards compatible, because it is extensively used in any business and tons of those have old machines that need to work 20 years before they pay themselves back, and thus need compatible OSes to run it.
Lately, Microsoft is finally trimming the fat that has been dragging along for decades, while still maintaining the compatibility by making it optional.
If updates were fully backwards compatible, they wouldn’t be upgrades, they would be addons.
Windows has been notoriously backwards compatible, because it is extensively used in any business and tons of those have old machines that need to work 20 years before they pay themselves back, and thus need compatible OSes to run it.
Lately, Microsoft is finally trimming the fat that has been dragging along for decades, while still maintaining the compatibility by making it optional.